New Irish OS Maps on the way | Forum — The Modern Antiquarian

FourWinds May 13, 2009 06:24:01

The OSI are about to produce a new set of maps for Ireland. The details are:

1:50000
Each map will be 40km x 40km with no overlaps
68 maps instead of 89
Double sided printing
No more Irish Grid References - moving to ITM (Irish Transverse Mercator, a version of UTM)

The move is being made because the algorithm used to plot Irish Grid References is not exactly GPS friendly and loses accuracy at various points due to a difference in the compensation for the earth's curvature (I think).

Yes ... a new set of maps to buy!!! I will be displaying ITM coordinates alongside the Grid Refs on megalithomania shortly.

More info at:

http://www.walkersassociation.ie/OSIDiscovery/consultation/MVonNewMap

http://www.osi.ie/en/alist/reference-information.aspx?article=50148558-fe55-4c49-b6d9-4892bd8011ac

http://en.wikipedia.org/wiki/Irish_Transverse_Mercator

http://www.osi.ie/calculators/converter_index.asp#results

gjrk May 13, 2009 12:40:00

Replying to FourWinds

(Oh dear God) a new set of maps to buy.

Thanks for the info 4W.

gjrk May 13, 2009 13:55:38

Replying to FourWinds

Just had a glance over at your website - wonderful photos of Kilgowen stone.

An interesting read in the Dáil report, at the bottom of the page, as well. Happy ending of a sort, though a fair amount of damage was already done.

http://www.megalithomania.com/show/site/104/Kilgowen.htm

goffik May 14, 2009 13:50:19

Replying to FourWinds

I'm probably showing my ignorance here, but having never used (alright - or even ever seen, dammit!) any of the existing Irish maps, how do they compare, detail-wise, with those of the UK OS maps?

I know these mentioned are only 1:50000, but no doubt 1:25000 will surely follow.

I only ask, cos the French 25k ones I bought recently - while OK and perfectly readable - don't seem as detailed as our good old OS ones!

Unless it's just cos I'm so used to them that I find them a lot easier to read...

G x